Machine for manufacturing and sharpening star-bit drills.



'PATENTBD MAR. 3, 1908. H. O. PALMER. l

G STAR BIT DRILLS.

MACHINE FOR MANUFACTURING AND SHARPENIN APPLICATION FILED MAR 31. 1906.

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PATBNTED MAR. 3, 1908.

' H. 0. PALMER. n MACHINEPOR MANUFACTURING'AND SHARPENING STAR BIT D HILLS.

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APPLICATION FILED MAR 31. 1906.

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No. 880,567. A PATEN'IED MAR. 3, 1908.

- H. O. PALMER` MACHINE POR MANUFACTURING AND SHARPENING STAR BITI D BILLS.

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APPLICATION FILED MAR-31, 1906.

d I i mum ifomeyo nl III l H. o. PALMER. MACHINE PoR MANUPACT PATENTED MAR. 3, 1908.

URING AND SHARPENING STAR BIT DRILLS.

APPLICATION FILED MAR 31, 1906.

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' [NVE/Wok Alfomeya PATENTED MAR. s, 1908. H. o. PALMER.

MACHINE FORV MANUFACTURING AND SARPENING STARA BIT DRILLS:

APIfLIGATION FILED MAR 31. 1906.

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PATENTBDMAR. 3, 1908.

H. PALMER.

RING AND SHARPENING STAR BIT DRILLS.

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MACHINE FOR MANUPAGTU APPLIGATION FILED MAR 31. 1906.

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UNITED STATES PATENT OFFICE.

MACHINE FOR MANUFACTURING AND SHARPENING STAR-BIT DRILLS.

T 0 all 'whom it may concern:

Be it known that I, HARRY O. PALMER, citizen of the United States, residing at vWashington, in the District of Columbia, have invented certain new and useful Improvements in Machines for Manufacturing and Sharpening Star-Bit Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable' others skilled in the art to which it appertains to make and use the same.

My invention consists in the novel features hereinafter described, reference being had to the accompanying drawings which illustrate one form in which I have contemplated embodying my invention and said invention is fully disclosed in the following description and claims.

Referring to the accompanying drawings, Figure 1 represents a side elevation of a machine embodying my invention, a portion of the cylinder at the left hand end of the said gure being broken away. Fig. 2 is a top plan view of the apparatus as shown in Fig. 1. Fig. 3 is a central vertical longitudinal section of the machine, a portion of the cylinder for actuating the feeding carriage and grippers being broken away. Fig. 4 is an end elevation of the apparatus. Fig. 5 is an enlarged detail sectional view taken inavertical plane, of the feeding carriage, gripping mechanism and cylinder and piston for operating the same. Fig. 6 is a horizontal' sectional View of the cylinder shown in Fig. 5. Fig. 7 is a similar view to Fig. 6 showing the piston and connected parts in a diHerent position. Fig. S represents a transverse vertical sectional View through the cylinder shown in Figs. 5, 6 and 7. Fig. 9 is a detail view partly-in section showing the valve mechanism for controlling the main cylinders and pistons of the machine and the governing device and connected mechanism for controlling said valves and said main piston. Fig. 10 is a detail view in side elevation of the governing device and connected mechanism for controlling the main piston valve. Fig. 11 is an enlarged vertical sectional view of the main piston valves and portions of the main cylinder and piston. Fig. 12 is an enlarged vertical sectional view of the governing device showing the cylinder, piston and controlling valve mechanism therefor. Fig. 13 is a horizontal sectional view of the governing device taken on the line 13-13 of Fig. 12. Fig. 14 represents a vertical transverse section taken on I Specification of Letters Patent.

Application led March 31. 1906. Serial No. 309.137.

Patented March 3, 1908.

the line 14-14 of Fig. 13. plan view of the governor'controlling valve detached. the horizontal slide Valve for operating the governor controlling valve. Fig. 17 is an enlarged central transverse sectional view taken through one of the man piston valves. Fig. `18 is an enlarged horizontal sectional view of the same. Fig. 19 is an enlarged transverse section of the valve taken through oneof the inlet ports.

The object of my invention is to provide a machine for manufacturing, vor forging, or sharpening star-bit rock drills used by miners and others by the use of certain dies anda dolly-tool such as are shown and described in my former patent of the United States No. 619,087 dated Feb. 7, 1899.

In carrying out my invention a steel bar from which the drill is to be forged is heated Fig. 15 is a top Fig. 16 is a bottom plan view of to the desired temperature and is placed in gripping devices upon a slidingcarriage and moved or fed forward into proper position and held while the bar is operated upon simultaneously by four dies arranged in pairs opposite to each other and working in planes ally ofthe bar or stock and having V-shaped grooves crossing one another, being substantially the dolly-tool disclosed in my former patent, the said tool being caused to strikev against the shaped end which the said four dies are in process of making, and in intervals between the blows of the said dies.

My present invention relates more particularly to mechanism by which the operation of the lateral dies, and the dolly-tool can be controlled so that said parts shall operate continuously to strike alternating blows as before indicated, or so that either the dies or the dolly-tool may be thrown out of operation and the other device or devices continued in operation at the will of the operator, in order that the drill being forged may be drawn out further by the use of the lateral dies while the dolly-tool is inactive, or on the other hand, the star point of the drill canV be further upset by the dolly-tool while the lateral dies are inactive. My invention also contemplated certain details of construction all of which are hereinafter fully described to the end that the machine shall be fully under the control of the operator at all' stages of the forging operation and that vthe drills maybe accurately formed so that all of the four outer corners thereof shall be fully brought up and defined at the sharpened end of the drill asis necessary for the production of a high class drill.

In the accompanying drawings, A represents the main frame of the machine which is preferably a casting resting upon the feet a, as shown. At one end of the machine is a horizontal sliding carriage B supported between dovetailed guides b upon a plurality of rows of balls t located in semi-cylindrical grooves inthe top face of the frame A and bottom face of the carriage B respectively, as indicated in Fig. 1, for the purpose of insuring an easy movement of the carriage.

The bottom face of the carriage is also provided with a slot or recess b2 which engages a stop lug a, see Fig. 5, on the main frame, and of less longitudinal extent than the recess b2 so that this lu will limit the longitudinal movement of t ie carriage in both directions. A longitudinal groove b3 is formed in the center of the top face of the carriage and in this groove is located a longitudinal bar B provided with transversely disposed projections b4 on its upper face. This bar I term the gripper operating slide.

On the upper face of the carriage B are pivotally mounted a series of pairs of gripping devices b5, the members of each pair A l being located on opposite sides of the slide B. The outer end of each of these gripping devices is curved eccentrically to its point-of pivoting and is concaved and roughened in such manner as to effectively grip the stock or bar of steel from which the drill is to be is moved forward with respect to the carriage the outer ends of the gripping devices will be moved away from the stock while the opposite or rearward movement of the slide B will cause the gripping devices to simultaneously clamp the stock or bar between them.

The forward end of the carriage -B is recessed centrally to receive a pivoted leverB2 the upper end of which is rounded and engages a recess in the bottom of the gripper operating slide, see Fig. 5, for the purpose of shifting said slide with respect to the carriage in both directions. The front and rear walls of the recess in which this shifting lever B2 is located are so constructed that they.

will limit the forward and backward movement of the upper end of this lever las is clearly shown in Fig. 5.

Below the carriage B is located a cylinder C provided with a piston C working therein and a piston rod c which extends forward through the usual gland and is connected to the lower end of the shifting lever B2. The cylinder C is provided on one side with an inlet pipe c for steam, compressed air or other operating iuid, preferably steam, and on the side opposite is an exhaust pipe c2. The cylinder is also provided at its inner end with a water inlet pipe c3 which is connected with a supply of 'water under pressure, such as an ordinary water main and is provided with a suitable check valve c4. The piston C is bored at each end to form annular recesses leaving a solid web in the center to which the piston rod c is secured. The piston is also provided on the side adjacent to the steam inlet c with a longitudinal groove c5 which communicates by an inlet port c with the recess c7 at the outer end of the piston and byl an inlet port 08 with the recess 09 at the inner end of the piston. On the opposite side of the piston it is provided with a longitudinal groove C10 communicating by an exhaust port c11 with the recess c7 and by an exhaust port cl2 with the recess c". longitudinal groove c5 does not extend throughout the entire length of thepiston but is of such len th that it is always in communication witifi the steam inlet c and the groove c10 on the opposite side is always in communication with the exhaust pipe c2 for the cylinder. v

Within the recess c7 is a ring d fitted therein and of a width su'flicient to enable it to close both the inlet port c6 and the exhaust port c at the same time and in the recess c9 is located a similar ring d fitted therein and adapted to close the inlet and exhaust ports cs and cl2 respectively. These two rings are provided with inwardly extending lugs and are connected by rods d2 d2 which extend through the solid web or central portion of the piston and have a -sliding'engagement therein. The Yring d is also provided with a crossv piece to which isfconnected an operating rod D which extends through a stufling box in the end of the cylinder, so that by means of this rod the two rings may be simultaneously moved with respect to the piston. The movement of the rod D is controlled by a hand lever D pivotally secured to the main frame adjacent to the other end of the machine at a point convenient to the operator. A link d3 extends from this hand lever toward the cylinder and is connected to one end of a pivoted lever d4, the lower end of which is connected by a link d5 to' another pivoted lever d, the upper end of which is connected by a link Z7 with thel rod D, the points of pivoting of the levers d4 and el being such that a slight movement of the hand lever D produces a greater movement of the rod D in the same direction.

The operation of the mechanism thus far described in gripping the stock and moving it forward into position to be operated upon will now be described and is as follows When the carriage is at its eXtreme outer- "most, position the parts will be in a position illustrated in Figs. 5 and 6. l/Vhen the carriage is in this position, it is therein locked by means of a sliding bolt E illustrated in dotted lines in Fig. 5 and also shown in Fig. 1. This bolt is vertically arranged in the frame and is provided with a collar e between which and a portion of the frame a spiral spring e is arranged which normally holds the bolt in its highest position in which it is shown in Fig. 5, so as to engage the inner edge of the carriage B and prevent it from moving towards the dies. This bolt is connected with a foot lever E shown in Fig. 1, by means of a pivoted lever e2 so that by pressing on the foot lever E the bolt may be withdrawn from the path of the carriage.

The parts being in the position shown in Figs. 5 and 6, the piston C will be at its outermost position and the inner end of the cylinder will be filled with water supplied by the pipe c3. A bar of steel to be used for the formation of a drill and heated to the desired temperature, is laid upon the carriage B between the opposing gripping devices b5 and the operator will then move the lever D to the right (see Fig. 1), thus causing the two rings d and (Z/ to move inward-l5l in the piston recesses. The result of this movement of the ring will be that the steam inlet port c6 at the outer end of the piston will be uncovered by the ring d. but the ring d is of greater width than the ring d and this movement sufficient to uncover the inlet port c is not sufficient to open the exhaust port c12 and therefore while steam at boiler pressure (or other motive fluid) is admitted at the outer end of the cylinder, the piston cannot move on account of the resistance of the water contained in the inner end of the cylinder. A further movement of the lever D to the right will slightly open the exhaust port c and permit a small quantity of the water to pass into the exhaust pipe c2 when the piston will begin to move inward and it will be noticed that by reason of this construction, the movement of the piston in a direction toward the dies of the machine, will always be controlled by the operator and regulated by allowing a hrger or smaller quantity of the water to escape into the exhaust pipe, which at the same time controls the speed of movement of the piston. 1t will also be noted that the inward movement of the piston can be ininstantly checked by' a slight reverse movement of the hand lever D sufficient to close the exhaust port cl2, Without closing the steam inlet port c6 (see Fig. 7), thusholding the piston in the position at which it is arrested with the full force of the steam at boiler pressure behind it. This construction `enables the operator to move the piston inwardly slowly or rapidly and to cause it to move very short distances when required, the speed and amount of movement being perfectly under control while maintaining` the full initial pressure of the motive fluid behind the piston.

As before stated, at the moment the piston first begins to move forward the carriage B is held from movement by the locking heilt E, so that the movement. of the pistonis transmitted by the piston. rod c to the lower end of the shifting lever B2, see Fig. 5 which causes the upper end of said lever to move rearwardly, carrying with it the gripper operating slide B, the projections b4 of which move the gripping devices b5 and cause them to firmly grip the steel bar or stock which has been placed between them, as will be readily understood. The steel bar being now firmly gripped upon the carriage so as to be held from any outward movement and enable it to resist the blows of the die tools, hereinafter described, the operator places his foot on the foot lever F] and withdraws the bolt E and the further movement of the piston. inward then causes the entire carriage B to move toward the dies passing over the top of the bolt E which engages a plane bottom surface of the carriage at one side of the gripper operating slide, thus preventing the bolt from rising and making it unnecessary for the operator to keep his foot on the lever E. The operator will open the exhaust port c" so as to allow the carriage to move quickly inward until the steel bar is in proper position to be operated upon, when he will cut off the exhaust port c12 by a reverse movement of the lever D, permitting the steam inlet port c6 to remain open and allowing the pressure of steam behind the piston to hold the piston in position and through its connection with the carriage to resist the blows of the dolly-tool During the formation of the star-bit drill by means of the dies and tool before referred to, the operator by means of the hand lever D can feed up the stock from time to time as may be necessary and when the drill' is completed the lever Dl will be reversed so as to throw the rings d, d into theposition shown in Fig. 6, causing the ring d to close the inlet port c and open the exhaust port C11, and the ring d to close the exhaust port 012 and open the inlet port cg. This admits steam into the inner end of the piston cylinder and causes the return movement of the piston carrying with it the carriage B until the inner end of the recess b2 engages the stop lug c', when the carriage will be arrested and the further outward movement4 of the piston will shift the lever B2 causing its upper end to move inward carrying with it the gripper operating slide and automatically releasing the gripping devices b5 from the 'finished drill. carriage B is arrested by the stop lug c', the spring actuated locking bol-t E will move upwardly so as to lock the carriage in its outermost position. As the steam in the inner end of the cylinder condenses, additional water will enter under the supply pressure through the check valve c4 and pipe c3 so as to maintain the pressure of the water in the inner end of the cylinder. l

Situated over the central portion of the main frame and at some distance from the feeding carriage B is the main cylinder F which is divided by a central partitionf into two separate cylinders axially alined and provided at each end with the usual stuffing box. F and F2 are the two istons working in the two halves ofthe 'cy inder and provided respectively with the piston rods F3 and F4. The piston F3 is provided with a socket to receive the dolly-tool G the shank of which extends into said recess and is secured by a set screw g which also passes through a threaded collar 7L in the center of a yoke H, see Fig. 2 and Fig. 3. The outer ends of said yoke are provided with collars h which encircle guide rods h2 'rigidlysupported in a horizontal position and each of said guide rods is provided adjacent to each end with a spiral spring h3 and washer h4 for the purpose of serving as a buffer to prevent the piston F from striking either end of the cylinder.

The piston rod F 4 has its rear end supported in an auxiliary guide a2, secured to the main frame, and said piston rod is provided within said guide with a collar I pinned thereto and provided with four perforated lugs i arranged in pairs on opposite sides ofthe center of the rod, the lugs of one pair being in a plane at right angles to theA lugs of the other pair. These lugs are connected by links t to the outer end of four die operating levers I, see Figs. 1, 2 and 3 which are pivoted at or about their centers in supports provided on the main frame and have their opposite ends extending in a direction toward the end of the machine where the carriage B is located. These ends of the llevers, which I term their inner ends, are

connected by links t2, best seen in F ig. 3, with four sliding die carriers l2 working in a four-way guide I3 supported in the main frame and each of said die holders or cary riers is provided with means, preferably a dovetailed groove, for receiving one of the four lateral forming `dies J, said dies being constructed. substantially as illustrated and described in my former application above referred to. .It is obvious from the foregoing construction that when the piston F2 At the instant that thel moves outwardly or to the right in Fig. 3 the four dies J will be brought together simultaneously upon the heated bar Iof steel `or-stock, so as to give it a com ressing blow from four directions at once anc the dies are so shaped that the lateral grooves ofthe star-bit form of drill, can thus be rapidly formed by the successive action or operation of these dies. The extreme end of the piston rod F4 is .provided with a cross bar or yoke K,fthe outer ends of which are perforated and through these perforations pass stationary `guide rods lc, k, `each of whichis provided with a buffer spring r to prevent the piston F2 from striking the partition f in the cylinder.

The main cylinders are provided on'their` lower side with the branch drain pipes -Z and' nicate with the main exhaust pipes L2, L

which in turn communicate with the main common exhaust pipe L1 to, which thecondensed steam from all the exhaust ports of the various operating cylinders ofthe machine is conveyed and frornwhich the -exhaust steam and water of condensation is carried off.

The mechanism for admitting steam to and exhausting it from the main cylinders andthe valves immediately controlling'the inlet and exhaust ports will now be described, special referenoebeing had to Fig. 11, in which these parts are shown drawn yto an enlarged scale. provided on their upper side with an exhaust passage f which passages communicate di- The vcylinders are eachs rectly with the main exhaust pipes L2 and l L3 and each cylinder is also provided with ports f2, similar to those of` an ordinary steam engine. Above each of the main cylinders is located a main valve chest M Aand M2 respectively, of cylindrical form and separated by the partition m. Each of said valve chests is provided with a main Asteam inlet M supplied with steam bymeans of' pipes M3 and M? from the main common steam pipe M5 of the machine, see Fig. 1, which supplies steam to all the steam actuated piston cylinders lof the machine and is controlled by a main cock or cut oif M6 Voperated by a vertical rod .M7 extending upward through the machine and provided Iat its upper end with a handle M2. In each of the valve chests M and M2 is located a valve mechanism and as the construction of these valve mechanisms is identical, a description of one will serve for both. The construction of this valve'mechanism is illustrated in detail in Figs. 17, 18 and 19 on Sheet 4.

N represents the piston valveI which is itself a piston and works in the cylindrical 1 valve chest being held from rotation within the chest by a guide rod nX secured in the partition m and having a portion extending into each of the valve chests and engaging a guiding recess in each of the valves as i shown, particularly in Fig. 11. The valve l N has the central portion of its upper face cut away leaving a flat upper face which forms an inlet passage at all times in communication with the main steam inlet M.

The valve is provided with the main steam ports n and n which are placed in communication with the ports f2, f3 communicating with the opposite ends of the main piston cylinder. The bottom part of the valve is provided centrally with an exhaust port n2 adapted to be placed alternately in communication with the cylinder portsz, f3. The' longitudinal movement of the valve N is produced by the steam or other motor fluid acting upon the opposite ends of the valve and controlled by a governor, hereinafter described. At each end of the valve N an annular recess is provided which is indicated at n3 n3; each of said recesses communicates by a small auxiliary inlet port n4 with the steam inlet recess at the top of the valve and each recess also communicates with a transversely extending auxiliary exhaust port o5 which is drilled through the lateral wall of the recess, see Fig. 18, and communicates with a longitudinal groove n in the side of the valve, and this groove communicates by a short groove a7 extending downwardly around the piston with the exhaust port n2,

see Figs. 17 and 1S. Vithn each of the recesses n3 of the piston, is a ring as capable of Y longitudinal movement therein for the purpose of alternately opening and closing the auxiliary inlet and exhaust ports n4, a5 before referred to, and these rings are connected for joint movement by a rod ng which extends through a central portion of the piston valve N and through a stuffing box at the outer end of the valve chest, the rod ng being operated by a governing device, as

hereinafter described. The rings ns are so attached to the rod n that when one of said rings is in position to open the auxiliary inlet port n4, the exhaust port n will be closed and the ring at the opposite end of the valve will be in position to close the inlet n4 and open the auxiliary exhaust port n.

In will be seen by reference to Fig. 11 that when the rings are in the position therein shown, steamcan enter the recess n3 at the right hand end of the valve N and pass through the ring to the steam space at the end of the valve, thus driving the valve to the other end of the steam chest, the exhaust steam at the other end of the valve escaping through the auxiliary exhaust port 'a5 and the shifting of the valve will shift the main inlet ports n, n and exhaust port n2 and thus control the movement of the main piston of the machine. The shifting of the valve rod a9 in the opposite direction will admit steam to the opposite end of the valve and thus the valve N will be shifted from one end of its chest to the other whenever the valve rod n is shifted, thus controlling the action of the main piston in the cylinder. 1t may also be stated that the governing or controlling device, hereinafter described, is so con-l structed as to shift the valve rod n always in the same direction so that the valve N will work in the same direction and simultaneously and the main pistons F', F2 are thus caused to move simultaneously in the same direction whenever both are in operation, or in other Words in step with each other. A

ln Fig. 9 1 have shown a top plan view of the two valve chests 1W, M2 and valves N with the governing or controlling device therefor, detached from the other portions of the machine and Fig. 10 represents a side elevation of the governing device and connected parts, while Figs. 12 to 16 inclusive illustrate in detail the.construction of the governor piston and its controllin valves. Referring now to these figures, it wi l be seen that each of the valve rods n is connected to a pivoted lever O, the outer end of which is provided with an eye or yoke o through which passes a shifting rod o mounted in horizontal guides so as to be capable of longitudinal movement and provided with a yoke engaging collar 02- held adjustablybetween nuts o3 engaging a threaded portion of the rod. The longitudinal movements of these shifting rods effect the shifting of the valve rods n and the rings ns of the valves N.

P represents the cylinder of the governing device proper provided with a piston p and piston rod p. The piston rod extends through a guide p2 and is provided at its outer end with a downwardly extending slotted arm p3 adjustably secured to the piston rod and having its slot engaging a crank pin p4 on a crank disk P mounted on a bracket and provided on opposite sides with link operating crank pins p5, To each of these pins p5 is connected one of the rods o by devices similar to the ordinary link mech` anism which is used in steam engines. These link mechanisms are exactly similar and each comprises the following elements.

A link p is connected at one end to one of the crank pins p5 and at the other end to the bottom of theordinary slotted link p7, the upper end of which is pivoted to a shifting lever p8 pivoted on top of the cylinder P or other stationary portion of the frame and provided u ith the usual hand lever p0, ratchet segment p10 and pawl p11. p12 represents a block mounted in the slot of the link p7 and pivotally connected to one of the shifting rods 0. lt will thus be seen that when the piston p of the cylinder- P is in operation, the crank disk P will be oscillated and supposing both of the links p7 to be in their raised'position, as shown in Fig. 10, the two shifting rods 0 will be simultaneously moved in the same direction, and reciprocated as will be readily understood, thus causing corresponding reciprocation of the valves N and the main piston of the machine. It u ill also be seen that the stroke of either or both main pistons may be regulated by meansy of the hand lever p, the shifting of which varies the position of the link mechanism, so that a harder or easier blow may be struck with the dolly tool and harder or easier compressing blows may be struck with the lateral dies. lf now, it is desired to discontinue temporarily the operation of either the dolly tool or the dies, the corresponding lever pf will be operated to move down the slotted link to its lowest position when the point of pivoting at the upper end of the link will so nearly coincide with the pivotal connection of the block p12 with the corresponding shifting rod o', that the shifting rod vvill'not be operated and the corresponding tool or dies, as the case may be will be held out of operation while the rest of the apparatus will operate in its usual manner, thus placing the control of the forging devices directly under the operator ancv enabling him to use the lateral dies alone or .the t dolly tool alone or both alternately to effect the perfect formation of the star-bit drill. It will also be noted that after one of the pistons F or F2 has been thrown out of operation temporarily by shifting its corresponding link mechanism, when the link mechanism is returned to normal the crank disk P will cause the piston which has not been operating to begin to operate at the proper point in the cycle of movement of the pistons, so as to again work in step with the other piston.

The cylinder P, which I term the governor cylinder, is provided at one end with a valve chest P2 in which is a piston valve R, shown detached in Fig. 15, working transversely of the cylinder P and held from rotary movelment in the valve chest by means of a pin p13. The valve chest is provided on its upper side with a steam inlet pipe P3 and at its i lower side with an exhaust pipe P1, the former communicating with the main steam inlet pipe of the machine and the latter with the main exhaust pipe of the machine, and the steam inlet pipe P3 is provided with a cut ofrp or controlling cock P5, see Fig. 2. The valve chest P2 is also provided'with two inlet ports p11 and p15 communicating with opposite ends of the cylinder P and with an exhaust port p15 communicating` with the pipe P1.

The governor valve R has at its upper portion a flat, central face T, at each end of which is a transverse groove T. The valve is provided with a central vertically disposed exhaust port T2 extending throughthe valve and having a recess at its lower end, as shown in Fig. 14, constructed so as to place either of the ports p11 or p15 in communication with the exhaust port p16. The valve R is also provided at one side of the center with an inlet port T3 having an opening in the 'flattened portion of the valve and extendingr to one end of the valve, and on the other side of the center is another inlet port T4 having an opening in the flat face of the valve and extending to the opposite end thereof, the three ports T3, T2 and T4 being arranged in a line diagonally across the flattened upper surface of the valve. T5 represents what l term a D-valve or plate valve which is placed upon the flat upper face `of the piston valve R and is provided at each end with guiding lugs T6 Aengaging the groove T in the latter. The under face of the D-valve T5 is provided with two inclined or obliquely disposed parallel. recesses T7 T7. The D-valve T5, which is shown detached in Fig. 16, is of less width than the flat upper face of the valve R and is of 4a width sufficient to cover the central exhaust port T2 and one ofthe inlet ports T3, T4 thus exposing the other inlet port. When the D-valve is in this position, as shown for ex-1 ample in Figs. 12 and 13, the two ports which are covered by it are placed in communication h y means of one of the recesses T7 before described. It will thus be seen that by shifting the D-valve transversely of the valve R, steam can be admitted alternately to opposite ends of the valve R to effect its longitudinal movement, the inlet port T3 or T4 which is covered by the D-valve being placed in communication with the exhaust through one of the grooves T7. The reciprocation of the D-valve T5 across the upper face ofthe valve R is effected by means of a yoke Th, see Figs. 12, 13 and 14, which engages the D- valve but permits the D-valve to move under it longitudinally when the valve R lis reciprocated. The yoke T8 has attached to it a stem T9 which passes through a stuffing box into the interior1of the cylinder P and-extends into a hollow portion of the piston p` where it is provided with a head T1 Springs T11, T11 are provided at each end of the hollow portion of the piston rod, with which,v the head T10 engages yieldingly, and it will thus be seen that at each end of the stroke of the piston p one of these springs will strike the head T10 of the valve stem T9 and shift laterally the D-valve, thus causing the change in the relation of the ports effected thereby, to longitudinally shift the valve R which in turn causes the reverse movement of the piston p.

The stock holding and feeding mechanism herein shown and described, is not specifically claimed herein as the same will form the subjectmatter of another application.

`blows of the said What I claim and desire to secureby Letters Patent is 1. In a forging machine the combination with a plurality of laterally movable die holders, arranged to reciprocate toward and from the stock, in a plane perpendicular thereto, and a longitudinally movable dolly tool holder, arranged vto reciprocate in line with the stock, of operating mechanism for producing a continuous reciprocation of said die holders, a separate operating mechanism for producing a continuous reciprocation of the dolly tool holder, connections between said operating mechanisms for causing the blows of the said die holders to alternate with those of the dolly tool holder when the said mechanisms are operated simultaneously and a controlling device for said operating mechanisms for causing them to operate separately and also simultaneously, substantially as described.

2. In a forging machine the combination with a plurality of laterally movable die holders, arranged to reciprocate toward and from the stock, in a plane perpendicular thereto, and a longitudinally movable dolly tool holder, arranged to reciprocate in line with the stock, of operating mechanism for producing a continuous reciprocation of said die holders, a separate operating mechanism for producing a continouus reciprocation of the dolly tool holder, connections between said operating mechanisms for causing the die holders to alternate with those of the dolly tool holder when the said mechanisms are operated simultaneously and a controlling device for said operating mechanisms for causing them to operate separately and also simultaneously and independent devices for regulating the blow produced by each of said mechanisms, substantially as described.

3. In a forging machine, the combination with laterally movable die holders arranged to reciprocate toward and from the stock in a plane perpendicular thereto and a longitudinally movable dolly tool holder, arranged to reciprocate in line with the stock, and substantially perpendicularly to the plane of movement of said die holders, of a piston and cylinder for continuously reciprocating said die holders, a separate piston and cylinder for continuously reciprocating said dolly tool, connections between said cylinders for causing the blows of said dies to alternate with those of the dolly tool when the said pistons are simultaneously' operated, and means for operating said pistons simultaneously and means for operating each of said pistons separately and independently, substantially as described.

4. In a forging machine the combination with laterally movable die holders arranged to reciprocate toward and from the stock in G5 a plane perpendicular thereto and a longitudinally movable dolly tool holder, arranged to reciprocate in line with the stock, and substantially perpendicularly to the plane of movement of said die holders, of a piston and cylinder for continuously reciprocating said die holders, a separate piston and cylinder for continuously reciprocating said dolly tool, connections between said cylinders for causing the blows of said dies to alternate with those of the dolly tool when the said pistons are simultaneously operated, means for operating said pistons simultaneously and means for operating each of said pistons separately and independently, and independent adjustable devices, connected with said cylinders for regulating the force of the blows produced thereby, substantially as described.

5. In a forging machine, the combination with a plurality of separate main cylinders, and pistons and a separate controlling valve mechanism for each cylinder, of a governing device comprising a cylinder and a piston working therein, connections between said piston and the said separate valve mechanisms, for the main cylinders, and manually operated devices for varying the control of said main cylinders and pistons by said governing device, substantially as described.

6. In a forging machine, the combination with a plurality of separate main cylinders and pistons and controlling valve -mechanism for each cylinder, of a governing device comprising a cylinder, a reciprocating piston therein, connections between said piston-and the controlling valve mechanisms for said separate main cylinders, and manually operated devices in said connections for varying the operation of the main pistons under the control of said governing device, substantially as described.

7. In a foregoing machine, the combination with a main cylinder and piston and a separate main cylinder and piston, of a governing device Comprising among its members a cylinder, a piston working therein and operatively controlling the admission of motor fluid to the main cylinders, and independent adjustable devices between said governor piston and each of said main cylinders for regulating the stroke of, and stopping the action of their pistons, substantially as described.

S. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of a valve chest and controlling valve for each of said main cylinders and a governing device ineluding among its members, a cylinder, a piston working therein, operative connections between said piston andsaid controlling valves, for normally effecting the joint action of said valves and the main pistons, and independent hand operated adjusting devices interposed between said governor piston and said controlling valves for regulating the stroke of the main pistons, and stopping the operation thereof, substantially as described.

9. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of a valve chest and controlling valve for each of said main cylinders and a governing device including among its members, a cylinder, a piston working therein, operative connections between said piston and said controlling valves, l" or normally effecting the joint action of said valves and the main pistons, and independently operable link motions, interposed between said governor piston and said controlling valves, for regulating the stroke of said main pistons or throwing either of them out of `operation, substantially as described.

10. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinderl and piston, of a valve chest for each of the main cylinders, a controlling -piston valve in each of said valve chests, provided with controlling ports for the main cylinder, and with separate ports for securing the reciprocation of said piston valve, rings movable with respect to said valves for controlling the movements of said valves, a governing device including among its members, a cylinder and a piston operating therein, connections between said piston and said rings, including independent link motions, and independent hand levers for shifting the links of said link motions, substantially as described.

11. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of a valve chest for each of the main cylinders, a controlling piston valve in each of said valve chests, provided with controlling ports for the main cylinder, and With separate ports for securing the reciprocation of said piston valve, rings movable with respect to said valves for controlling the movements of said valves, a governing device including among itsgmembers, a cylinder and a piston operating therein, an automatically operated controlling valve for said governor cylinder and piston', cranks operated by said governor piston, connections between said cranks and said valve controlling rings, including link motions, and independent hand levers for shifting the links of said link motions, substantially as described.

12. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of a governing device comprising among its members, a cylinder, a piston working therein, an automatic controlling valve for causing the continuous reciprocation of said governor piston, and connections between said governor piston and the main cylinders, for controlling the admission of motor .iiuid to the latter and manually operated devices for varying the control of said main pistons by said governing device, substantially as described.

13. In a forging machine, the combi-nation with a main cylinder and piston, and a separate main cylinder and piston, of la governing device comprising among its -members, f a cylinder, a piston working therein, an automatic controlling valve for causing the continuous reciprocation of said governor piston, connections between said governor 4piston and the main cylinders for controlling the admission of motor fluid-to the latter, and independent hand operated devices for adjusting said connections to independently control the stroke of'each main piston or stop its action, substantially as described.

14. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of independent valve chests and controlling valves for said main cylinders, and a governing 'device including among its members, a cylinder, a piston working therein, an automatic valve for said vgovernor cylinder .for -causing the continuous reciprocation thereof, vand independently adjustable connections between said governor piston and said controlling valves for the main cylinders, substantially as described.

15. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of independent valve chests and `controlling valves Tfor said maincylinders, and a governing vdevice including among its members, a cylinder, a piston working therein, an automatic valve for said governor cylinder having a part operated automatically by the reciprocations of the governor piston, and independently adjustable connections between thel governor piston land the saidv controlling valves for the main cylinders and manually operated devices for adjusting said connections, while the machine is in operation to vary the'action of said main cylindersor either of them, substantially las described.

16. In a forging machine, the combination with a main cylinder and piston, and a separate main cylinder and piston, of independent valve chests and controlling valves for said main cylinders, and a governing device including among its members, a cylinder, a piston working therein, an automatic valve for said governor cylinder having a part-provided with a stem Working in a hollow portion of the governor piston, and adapted to be shifted by the reciprocations thereof, and independently adjustable connections between said governor piston and the controlling valves for the main pistons and independent hand operated devicesy for adjusting said connections while the machine is in Y cylinder, and independent ports for recipron cylinders or either of them, substantially as described.

17. In a forging machine, the combination with a niain cylinder and piston, and a separate main cylinder and piston, of independent valve chests and controlling valves for said main cylinders, and a governingdevice including among its members, a cylinder, a piston working therein, an automatic valve for said governor cylinder in the form of a piston and provided with port s for controlling the admission of fluid to the governor operation to vary the action of said main x eating said automatic piston valve, a D- valve cooperating with said automatic valve, and provided with a part adapted to be operated by the governor piston to shift said D-valve at each stroke thereof, and connections between said governor piston and the controlling valves for the niain cylinders, having independent hand adjusting devices for regulating the stroke of and stopping the main pistons, substantially as described.

18. In a forging machine, the combination with a main cylinder and piston, a separate main cylinder and piston, separate steam chests for said cylinders, a giston valve in each of' said chests, rings in each ofsaid valves for controlling its movement, a governor including piston Working therein, an automatic valve controlling said governor cylinder and piston, cranks operatively governor piston, separate connections between said cranks and said valve rings, including slotted links and independent hand operated devices 'for shifting said slotted links to independently regulate the stroke of or throw out of operation the inain pistons, substantially as described.

In testimony whereof l a'HiX my signature, in the presence of two witnesses.

HARRY O. PALMER. Witnesses L. P. WHITAKER, J. K. MOORE.

among its members a cylinder, a.

connected With the 

